Ten-key setting mechanism



June 14, 1960 G. HORNAUER 2,940,664

TEN-KEY SETT-ING MECHANISM Filed July '7, 195a ATrO F/VE) me'sne assignments,

2,940,664 TEN-KEY SETTING MECHANISM Giinter Hornauer, Berlin-Rudow, Germany, assignor, by to Hamann-Rechenmaschinen, a company of Germany Filed July 7, 1953, Ser. No. 366,405 Claims priority, application Germany July 11, 1952 3 Claims. (Cl. 235-60) Berlin, Germany,

This invention relates to a setting mechanism for tenkey calculating machines, adding machines, accounting machines and the like which makes possible the correction of any ordinal integer previously introduced by the keys.

"In accordance with the invention, manually-operated members are provided for the displacement of setting Y mechanism elements to correct values introduced by the keys. By means of these manually-operated members, a value shown to the operator, for example in an indicatingmechanism of the setting mechanism, can be modilied, and this modification can be effected at any decimal position and there is no necessity for the complete or partial cancellation of the setting mechanism, as in prior 'designates a pin carriage into which values are introduced in known manner. A reset rocker arm 2 is rotatably mounted for. oscillation about the axis of a shaft 3 "in response to depression of a function control key.

The shaft} carries loosely mounted thereon toothed sectors 4, only one being shown, and thecooperating elements for this sector only being shown with it. Also loosely mounted on the shaft 3 is a three armed intermediate member 7 having an arm 8 to which is secured a spring 6, for normally urging member 7 in a counterclockwise direction, an arm 9 which carries alug 16 for cooperation with a value scanning lever 15, and a arm 10 which is formed with a radial slot 11. In 'slot 11 is seated a pin 12 which is connected to a two armed coupling lever 13 which has a lever arm provided atits end with a lug 14 adapted to be received in a notch formed in the sector 4 to provide a mechanical connection therewith. Lever 13 is. rotatably mounted on the leg of value scanning lever 15 which is loosely mounted on shaft}. Lever 15 and intermediate member 7 are connected by means of a traction spring 26. A two armed lever 21 is pivoted at theaxis of the shaft 3, and arranged to cooperate with one arm of lever 21 is a second lever23 which carries a locking rocker arm 22 having an end adapted to engage a detent spring 28 for pressing, this spring between the teeth of the toothed sector 4. A spring 27 normally urges the rocker arm 22 out of engagement with the stop spring 28. The teeth of each of toothed sectors 4 mesh with the teeth of an intermediate wheel 17 which in turn mesh with the teeth or a numbered indicating wheel 18 which is visible United States Patent I Patented June 14,1960

through an opening in the cover 20. The indicating wheel 18 meshes with a manually operable milled wheel 19 which extends partly through another aperture in the cover of the machine. Rotation of milled wheel 19, therefore, cause circumferential displacement of sector 4 and'causes the spring to be lifted out of the teeth of the sector when the rocker arm 22 is not pressing upon the spring.

A pawl 24 acted on by a spring 25 is positioned to engage and latch the other arm of lever 21 for temporarily holding it against movement. A rocker arm 29 which may be integral with a rocker arm 5 is rotatable about the axis of shaft 3 for movement in the path of an arm of the pawl 24 for disengaging it from the lever 21.

In operating the above-described machine, a value to be introduced into the machine is set into the pin caniage I by means for a conventional ten-key keyboard. A representative setting of the pin carriage is illustrated in the drawing by the raised pin corresponding to numeral value 6. Pin carriages, such as the pin carriage 1 of the embodiment shown, are well known in the art and further illustration or description is believed unnecessary. Also, the means for rocking the arms 2, 5, and 29 are not illustrated, it being suflicient to state that the rocking of such arms under the control of a main operating shaft, is well known in the art, such as the operating shaft 50 shown in the U.S. Patent No. 1,812,020.

Cyclic operation of a drive mechanism in the machine, in response to the aforementioned function control key, causes the rocker arms 2, 5, and 29 to oscillate in timed sequence. In the initial phase of the cycle, reset rocker arm 2 is rotated clockwise from its initial rest position 2a to the position 2b. During such movement, rocker arm 2 rotates all sectors 4 from their respective differentially set positions to a common zero position.

As soon as rocker arm 2 has reached position 2b, rocker arm 5 starts to move counterclockwise, this being the initial phase in setting up a new value in sectors 4 during the current cycle. In its movement from its initial rest position 5a to an intermediate position 5b, it is followed, by reason of the traction of spring 6 upon arm 8, by three-armed intermediate member 7, which is freely rotatable on shaft 3. When arm 5 is in its initial position, it stands in a position 5a which is somewhat clockwise from the position 5b shown and, due to spring connection 26, tends to rock the scanning lever 15 in a simi-' lar direction; however, the lever 15, at such time, is blocked by a portion of the framework, as shown, and thus, spring 26 is placed under additional tension and lug 16 on member 7 is rocked clockwise away from lever 15. -'Ilhe movement of member 7 relative to lever 15 causes the coupling lever 13 to rock counterclockwise out of coupling relationship with sector 4. This is the relationship of the various parts at the beginning of an operating cycle. Subsequently, as a result of the displacement of rocker arm 5 from position 5a to position 5b, and the corresponding movement of the intermediate member 7 counterclockwise relative to scanning lever 15 which is held against the framework by spring 26, the coupling lever 13 is positively displaced clockwise and the lug 14 is directed into the notch of the sector 4, thereby coupling the latter with the value scanning lever 15. The rocker arm 5 then continues in its movement to position 50. At the same time, rocker arm 2 moves back from position 2b to its initial position 2a. Acted upon by lug 16 of arm 9, the value scanning lever 15 follows rocker arm 5. Through the previously-mentioned connection of sector 4 with value scanner 15, the sector 4 moves with the scanner. The scanner 15 foling wheel 19. i'ng mechanism resets the pin carriage to initialposition lows the rocker arm until it is stopped by the pin corresponding to the value 6, shown set up in the pin carriage 1, while the rocker arm 5 continues on to position 5c. The displacement of the sector 4 as it follows value scanner 15 causes corresponding rotation of the interin turn acts upon lever 23 to move the locking arm 22 clockwise against spring 28 to lock the sector 4 in set position. As position 50 is reached by the rocker arm 5, pawl 24' drops, under the action of spring 25, behind lever 21, and as a result rocker arm 22 is held in locked position. When the rocker arm 22 is in this position, H the sector 4 is locked until near the end of the current operating cycle.

Rocker arm 5 now starts its return movement from position 50 to position 5a, rotating clockwise until it engages arm 9 of the intermediate member 7. Continued movement of arm 5 rotates intermediate member 7 clockwise relative to the scanner 15, against the tension of spring 26 since the scanner 15 is held stationary by virtue of its connection through coupling lever 1.3 to locked sector 4. Clockwise rotation-of member 7 relative to Scanner 15, lifts the lug 14 out of the notch of sector 4, The mechanical connection between sector 4 and'scanner 15 is thus released, and scanner 15 together with intermediate member 7 are free to be returned into zero position under the action of rocker arm 5. During the last portion of the return movement 'ofrocker arm 5, the pawl 24 is rocked counterclockwise by rocker arm 2Q to release lever 21 and rocker arm 22 is retracted from engagement with the spring 28 by return spring 27 which is free to operate upon release of the lever 23 by the arm of lever 21. At thispoint, the sector 4 stands at its differentially set position held by thedetentjaction of spring28, but is free to be readjustedby means of adjust- The previously mentionedmain operatin the usual manner? Since the pin carriage resetting 'means forms no part of the invention, further detailed "description is omitted.

'By means of milled wheel 19, the operator can selectiv'ely changeorcorrect the value'to which sectors 4 are adjusted as indicated by the indicator wheel 18. A new value may also be introducedinto the pin carriage 1 without disturbing the current value set up inthe sectors 4. Clearing of the sectors before setting up a new value in the pin carriage is thus unnecessary because the sectors 4 are automatically brought into the zero position by the action of rocker arm 2 before the new value is set up in the sectors.

Since the reset arm 2 is rocked from the position 2a to 2b and back to 20 thus resetting the sectors 4 and the "It is well known that a zero stop (not shown) but similar 'to the zero stop 41 of the previously mentioned Patent No. 1,812,020, or the zero stop 76 of the US. Patent No. 2,176,561 may be employed for this purpose, and in fact is customarily provided on all ten-key machines having pin carriages. Thus, in those orders where a zero stop is effective to prevent movement of the scanning *lever 15, the operation of the machine is a blank operation resulting only in resetting the sectors 4 and the numeral wheels 18 to zero.

The setting of the sectors 4, only one of which is shown, together with the indicator numeral wheels 18 to a selected value representative position under the control of the pin carriage, as previously described, prepares the machine for a subsequent calculation, in the next machine cycle, i.e., the sectors 4 serve to adjust means for controlling the accumulator actuators, print mechanisms, value storage and factor mechanisms, or the like; however, since the invention is directed only to the means for setting the sectors 4 and the numeral wheels under the control of the pin carriage 1 or under the control of the manually adjustable discs 19, further mention of the subsequent control exerted by the sectors 4 is believed unnecessary.

It will be obvious that various other changes and modifications may be made in theembodiment described above and shown on the drawings and it is intended, therefore, that all matter contained in the foregoingdescript-ion and in the drawings shall be interpreted as illustrative only. p

What I claim and desire to secure by Letters Patent 1. A calculating machine comprising a selectively settable pin carriage; ,a rotatable gear sector; an indicator numeral wheel constantly entrained with said gear sector; and means for rotating said gear sector and indicator wheel difierentially in accordance the value set-up in said pin carriage; comprising a rotatable scanning lever coaxial with said sector for scanconnected to said coupling means and being spring-urged to rotate said scanning lever from initial position to engage, a set pin; cyclically operable drive-mechanism .comprising a reset rocker arm and a rotatable rocker coaxial with said gear sector and oscillatable in timed sequence, said reset rocker arm being operable from a normal position during the initial part of the cycle to engage and restore said gear sector to initial position, said rotatable rocker arm engaging; and normally restraining said spring-urged rotation of said intermediate lever and being operable from a normal position, following. restoration of said gear sector, to release said intermediate lever for said limited movement relative .to said scanning lever to adjust said coupling to effective position and thereafter .to enable said intermediate lever, saidscanning lever and said coupled gear sector to move as a unit until differentially arrested by a set pin, sai d reset rocker arm being restored to normal position concurrently with the operation of said rotatable rocker arm; a detent for retaining said gear sector in differentially arrested position; said rotatable rocker arm being restored-to normal position during the terminal portion of thecycle to first engage and move said intermediate lever relative to said scanning lever to adjust said coupling means to infiective position and thereafter to engage and move both said intermediate lever and said .scanning lever to initial position independently of said sector.

2. A calculating machine as defined in claim 1 includingmeans for locking said detent in retaining position; means operable by said rotatable rocker arm for enabling said locking means; and a second rotatable rocker arm ,notatable intimed sequence with said first named rotatable rocker arm for disabling said locking means following adjustment of said coupling means to ineffective position.

3. A calculating machine as defined in claim 1 in eluding manually operable means'engaged with said indicator and operable to readjust the gear sector to any selected value representing position after said locking means is disabled.

1,253,310 Von Reppert Jan. 15, 1918 6 Robertson June 30, 1931 Gustafison et al Oct. 17, 1933 Siewert May 8, 1934 Foothorap May 22, 1934 Placke Oct. 17, 1939 Pott Sept. 29, 1942 Beria Sept. 29, 1942 Hellgren Dec. 1, 1942 Toby Jan. 23, 1951 Maier May 17, 1955 

